Add a macro to search a documentation dependency

  ADD_DOC_DEPENDENCY works as ADD_REQUIRED_DEPENDENCY except that it does not
  add the dependency in the "requires" field of the package.
  useful mainly for doxytag files.
update-doxygen-doc.sh: allow out of build use
Make licenses uniform
Add fix-license.sh script
Fix generated headers copyright
Merge pull request #22 from francois-keith/master

Cancel the force default libdir value.
[dist] Sign tarball.
Merge pull request #23 from olivier-stasse/master

[dist] Sign tarball.
Add gitlog-to-changelog script
Merge pull request #24 from thomas-moulard/master

Add gitlog-to-changelog script
[dist] Create automagically ChangeLog file in the tar ball.
Makes gitlog-to-chanloeg executable.
Prefix internal variables by an underscore to prevent naming clash on Gentoo.
Fix #25.
Merge pull request #26 from thomas-moulard/master

Prefix internal variables to prevent naming clash (fix #25)
Add nsiqcppstyle filefilter.txt
Fix filefilter.txt when using Travis
Fix detection of pkg-config additional variable (close #28)
Fix detection of pkg-config additional variable (close #28)
Correct the sphinx commands.

To run the sphinx command, the LD_LIBRARY_PATH has to be updated
so as to contain the path to the libraries.