Adding 'geometry'-Option
Introduced new Options for specifying the scan geometry. The options are the same as for gridrec.
Other changes in the code, generally clean-up (removed all the comments from at the beginnign of the file, since they can be seen in the git log). Simplifyied the setting/unsetting of the multicore option.

Fixes #1, as suggested by Peter
updated .gitignore
Script to retrieve tar-files from archivFTP

Based on rsync-command I wrote down on
https://intranet.psi.ch/Tomcat/Backups
Merge branches 'geometry-fix' and 'master'