Merge pull request #18 from satta/master

add `gt_feature_index_get_orig_range_for_seqid()`
fix floating point problems in hmm class

subtracting 2 (nearly) equal floats can result in huge errors, just
assign 0.0 to differences of "equal" floats.

fix issue #14
float compare x < y => x-y < -DBL_EPSILON
split up tests for travis

prevents builds from failing due to time restrictions
update documentation
Merge pull request #21 from Garonenur/travis

Travis
Merge pull request #22 from Garonenur/hmm_32bit

Hmm 32bit
add refcount to multieoplist, cosmetics
change show fct to reflect different edit ops

cosmetics
add a backtrack fct to the xdrop class

returns a multieoplist
Merge pull request #23 from Garonenur/dw

add backtracking to xdrop class
remove gitweb script
change old gitweb links to github
Merge pull request #24 from gordon/master

finish move to github (remove gitweb script and fix links)
fix bug in tool.conf

The link to 'Browse Source' was missing in the tool pages.
Merge pull request #25 from gordon/master

bug fix in tool.conf
change behaviour of gt_feature_node_remove_leaf(), add to API
fix logic error in seqabstract
Merge pull request #26 from satta/remove_leaf

change behaviour of gt_feature_node_remove_leaf(), add to API
Merge pull request #27 from Garonenur/dw

fix logic error in seqabstract