Having synced file permissions in Git repositories is a reccurring
issue. Git can track files as executables (0755) or not (0644). Usually,
all files except the executable ones such as command line scripts or
binary executables, should be set to 0644.
This patch syncs permissions in the Git repository.
The $Id$ keywords were used in Subversion where they can be substituted
with filename, last revision number change, last changed date, and last
user who changed it.
In Git this functionality is different and can be done with Git attribute
ident. These need to be defined manually for each file in the
.gitattributes file and are afterwards replaced with 40-character
hexadecimal blob object name which is based only on the particular file
contents.
This patch simplifies handling of $Id$ keywords by removing them since
they are not used anymore.
