Merge pull request #69 from blackwarthog/master

Fix bug with includes
Revert commit:7e74aa9

Interval criteria for Z Range is:
Full visible: z in [p, p+d]
Partially visible: z in [p-t, p) or (p+d, p+d+t]
Default d=0
Fix bug #490: Add point and keep shape (near bone influence) : signal aborted

It prevents to reverse manipulate bone influenced blinepoints as a whole.
It needs code to allow to distribute the changes to the link when received a blinepoint.
For the moment it is not possible to transform a whole blinepoint so it looks like
we need to modify each component one by one.
Allow Insert Item smart & keep shape work near bone influenced blinepoints.
Merge pull request #70 from genete/bug#490

Bug#490
The pkgconfig detection is not available for old versions of zlib, so  let's use simpler approach for now
Fix synfig-core compilation error on OSX 10.7
Merge pull request #71 from morevnaproject/master

Maintenance fixes
Fix bug #120: Lock prev/next keyrame buttons can't switch its toggle states
Merge pull request #75 from genete/bug#120

Fix bug #120
Fix bug#495

Half split tangents doesn't scale with Scale Tool
Merge pull request #76 from genete/bug#495

Fix bug#495
Fix typo that causes crash in debug mode and possible wrong work in release mode
Merge pull request #78 from genete/fix-typo

Fix typo that causes crash in debug mode and possible wrong work in rele...
Fix warning in filecontainerzip.cpp