Merge pull request #88 from babs/code-refactoring-trans-fr

Updated fr_FR translation
Crash handler now shows the Qt versions (built and currently running)
Build script change. Now the PKGCONFIG tool is not used to search PgSQL
/ XML2 headers/libs. Instead, the libraries/headers are specified on
PGSQL_INC|LIB and XML2_INC|LIB.
Correction on start-pgmodeler.sh. Startup was failing when the root path
contained blank spaces.
Partially fixed build process on Mac OS X. Need more tests.
Compilation fix on Linux systems.
Fixed build process on Mac OS X (issue #10)
Made some widgets font adjustments for better showing on Mac OS X.
Some widget font/size adjustments.
Base buttons size/alignment adjusted.
Class ConfAparenciaWidget refactored to AppearanceConfigWidget. Pending
comment translation.

Fixed bug when changing color of objects on AppearanceConfigWidget.
Fixed a bug when disconnecting a gen. relationship which has special
primary key.
Fixed a bug that was removing two sequences when intended to delete one.
(issue #90)
AppearanceConfigWidget refactoring done.