R: rename most functions for a better API, #553

Squashed commit of the following:

commit 4494e3933f9ac250fae692fc81086933c8e83061
Author: Gabor Csardi <csardi.gabor@gmail.com>
Date:   Tue Oct 7 12:54:39 2014 -0400

    R: fix building by tuning the collation order of files

commit cc9884ee2c20ee27dd3501696ce1072c80c5f922
Author: Gabor Csardi <csardi.gabor@gmail.com>
Date:   Tue Oct 7 10:37:32 2014 -0400

    R: add gorder (vcount) and gsize (ecount), #698

commit f5fd82021cb150df918af9611d9dd96955ba4f19
Author: Gabor Csardi <csardi.gabor@gmail.com>
Date:   Fri Oct 3 00:07:47 2014 -0400

    R: nexus function have underscore instead of dot now, #709

commit 488fc130f9b23a14ba2941c346fe1b5ea06b2949
Author: Gabor Csardi <csardi.gabor@gmail.com>
Date:   Thu Oct 2 23:12:26 2014 -0400

    Remove (r)evolver stuff, #702

commit 70fdd7b5476527bf913feefd8532b9ad000138d7
Author: Gabor Csardi <csardi.gabor@gmail.com>
Date:   Thu Oct 2 23:07:40 2014 -0400

    R: put DRL layout options in one object, #701

commit fe6401aa41dc160a597c0b69918a525222bf4f34
Author: Gabor Csardi <csardi.gabor@gmail.com>
Date:   Thu Oct 2 23:00:00 2014 -0400

    R: HRG API brush up, #700

commit b212254dce99edb4f4a7b3e516c38fcee7e2463f
Author: Gabor Csardi <csardi.gabor@gmail.com>
Date:   Thu Oct 2 22:43:39 2014 -0400

    R: slightly better attribute api, #699

    graph_attr, vertex_attr, edge_attr, can now query and set all attributes,
    even for a subset of vertices or edges.

commit 53805b2c3f949215edc5c66c2604b4b95890dd10
Author: Gabor Csardi <csardi.gabor@gmail.com>
Date:   Thu Oct 2 19:52:12 2014 -0400

    R: fix more renaming bugs

commit 6871dd427463c1ba5deefcf9b62abe940928e9cd
Author: Gabor Csardi <csardi.gabor@gmail.com>
Date:   Thu Oct 2 17:20:31 2014 -0400

    R: some renaming fixes

commit 434fad18969863ae24e8cfecef533b8a5513cb2d
Author: Gabor Csardi <csardi.gabor@gmail.com>
Date:   Thu Oct 2 17:05:36 2014 -0400

    R: more renaming, #553

commit 20534569bd0db037f1f9aaf78243c9c504454dfb
Author: Gabor Csardi <csardi.gabor@gmail.com>
Date:   Thu Oct 2 16:13:40 2014 -0400

    R: more renaming, #553

commit e36d5c4d2a41238a8c28c942325667301e79b1ac
Author: Gabor Csardi <csardi.gabor@gmail.com>
Date:   Wed Oct 1 23:17:13 2014 -0400

    Rename get.data.frame to data_frame, #697

commit 713eb37977b790d7eaffb496bf480bcbdaf880ab
Author: Gabor Csardi <csardi.gabor@gmail.com>
Date:   Wed Oct 1 23:13:35 2014 -0400

    Rename as.* and is.* functions, #697

commit 87b9af2dcae8dbbf7c4bec0e161edd3f9c4322fd
Author: Gabor Csardi <csardi.gabor@gmail.com>
Date:   Wed Oct 1 20:50:46 2014 -0400

    R: make arpack.unpack.complex internal #696

commit ad7a64d69f5f964721d22ccd0eda96f30549b0f3
Author: Gabor Csardi <csardi.gabor@gmail.com>
Date:   Wed Oct 1 20:47:25 2014 -0400

    R: remove edge.betweenness.community.merges, #695

commit bbb734c28173374e742ab2d48a134c54ba9cd0cb
Author: Gabor Csardi <csardi.gabor@gmail.com>
Date:   Wed Oct 1 19:39:10 2014 -0400

    R: remove community.le.to.membership, #693

    It was defunct, anyway. The same functionality will be
    eventually added to cut_at.

commit 78a6596698c618d36eb84639de71df32ef63ec9c
Author: Gabor Csardi <csardi.gabor@gmail.com>
Date:   Wed Oct 1 19:02:47 2014 -0400

    R: fix some renaming typos

commit df080f9f2cac7a0d9f139f24835ab4ec50bf0850
Author: Gabor Csardi <csardi.gabor@gmail.com>
Date:   Wed Oct 1 14:00:31 2014 -0400

    Finish renaming, #553

commit 021f252d100040541740ba2f04df3aa5a5e97b26
Author: Gabor Csardi <csardi.gabor@gmail.com>
Date:   Wed Oct 1 12:48:49 2014 -0400

    R: rename community structure functions, #692

commit f114cb59242db3b48c5ea78a9fb5b9ec0c122a05
Author: Gabor Csardi <csardi.gabor@gmail.com>
Date:   Wed Oct 1 11:26:10 2014 -0400

    R: renamed more centrality related functions #691

commit b80e0cf04e8a09a6bf30df68f932a76c3c6823de
Author: Gabor Csardi <csardi.gabor@gmail.com>
Date:   Wed Oct 1 10:49:42 2014 -0400

    R: renaming some centrality related functions #691

commit 0fc9b74e46a03ce9025fe4e2fb3a551dc43d4bbe
Author: Gabor Csardi <csardi.gabor@gmail.com>
Date:   Wed Oct 1 10:02:54 2014 -0400

    R: rename remaining constructors #553 #686

commit cbd5dec1a995b8a225d7382403adfb03926a0ce6
Author: Gabor Csardi <csardi.gabor@gmail.com>
Date:   Tue Sep 30 16:41:14 2014 -0400

    More renaming, #553

commit 2e2ec2c98d846504696800c2083d750a7ea76cd2
Author: Gabor Csardi <csardi.gabor@gmail.com>
Date:   Sun Sep 28 00:44:58 2014 -0400

    More renaming, #553

commit f8d8ef58ac67b1974b1ace028a3225b327e95f36
Author: Gabor Csardi <csardi.gabor@gmail.com>
Date:   Sat Sep 27 16:12:38 2014 -0400

    R: rename layout functions, #688

commit a94c8f24ee1917df9f27ce7394370e98e7fa2f92
Author: Gabor Csardi <csardi.gabor@gmail.com>
Date:   Fri Sep 26 23:59:44 2014 -0400

    Renaming most constructors, #686

commit 4cbe223554925c9c0b556bd70b1a4a5375e15961
Author: Gabor Csardi <csardi.gabor@gmail.com>
Date:   Fri Sep 26 15:48:24 2014 -0400

    R: graph.ring -> g_ring