Changes in 0.1.6

* Fixed build failure with sun cc.
* Fixed perl warnings.
* Fixes for cygwin build. Bug #80485
* Disable implementation of build/clean projects if no native gnu
  GRegexp implementation is found.
* Added support for HEADERS primary
* Fixed absolute to relative path conversion for files in the root
  directory (of the project).
* Fixed growing newlines at the end of Makefile.am files
* Fix handling of empty SUBDIRS when DIST_SUBDIRS is not empty.
* Improved dialogs and code clean up.
* Improved error reporting and display.
* Added validations for group/target/source. 
* Fixed target mime types (restores correct target icons).
* Added 'dz' translation.