Made a first version for edit:

	 * bibtexentry.py: Added getters/setters.
	 * gitbib.py: Edit function.
Fixed a bug in the parser:

Inlined entries were not parsed correctly.

		* bibtexentry.py: Here.
		* gitbib.py: Remove useless print.
Fix bug in parsing:

Last value of an entry was not read.

	 * bibtexentry.py: Here.
Did a first version for the show function:

	* config.py: Added a config line for the pdf viewer.
	* gitbib.py: Did the show function.
Now the file are handled in the bibtexentry.

Therefore, files are copied even in edition mode.

	* bibtexentry.py: Added the files handling.
	* gitbib.py: Removed the files handling from add.