Remove change history from preamble comments

[mlange05]

Many IFS/Arpege source files include a (sometime quite long) "history of changes" in the preamble comment. This information is nowadays easily obtained from the git history of the respective file, making it possible to remove these entries.

This issue was originally raised by @pmarguinaud in GPU adaptation additions. It pertains to the "Guidelines and recommendations" section. The original in-line comment was:

>>PM: suggestion: remove all history comments at the beginning of each routine; these can                                                                                                                                         
be obtained from git history.<<