igraph_pagerank and igraph_personalized_pagerank now uses PRPACK instead of ARPACK
added proper .gitignore file
updated configure.ac to support automake 1.13 and later
fixed 'make check'
R: repair package building, git cannot have empty directories in the repo, so create them before building the package.
Fixed spaces in interface definition file.
Merge branch 'develop' into 0.7-prpack

Conflicts:
	.gitignore
	configure.ac
	interfaces/R/Makefile
	interfaces/functions.def
	src/Makefile.am
Merge branch 'develop' into 0.7-prpack
R: make PRPACK compile in R package.
PR: redesigned pagerank C API.
Stimulus handles %C1%, etc in the RC outconv.
R: interface to new page rank API.
PR: updated C docs.
PR: update Python interface for new API.
PR: updated Python interface to new API.
PR: updated R docs for new page.rank.
PR: updated PRPACK, calling exit() from an R package is not allowed.
reverted changes in setup.py
PR: update link to github, this repo seems to be up to date.
Merge branch '0.7-prpack' of github.com:igraph/igraph into 0.7-prpack