Fix imports.
Merge branch 'devel' of github.com:saga-project/saga-python into devel

Conflicts:
	saga/job/description.py
Revert "Fix imports."

This reverts commit 479fab78434a3ead641d646c1965565c64b75ff2.

Conflicts:
	saga/job/description.py
Revert my commit.
Merge branch 'devel' of github.com:saga-project/saga-python into devel
oops...
Merge branch 'feature/sshjob' into devel
replace builtin exec with poor-man's version, which provide better error reporting though