Add the devtools/utils/ subdirectory

Two utilities:
- devtools/utils/chkmsg: check that messages used in the
    code are translated in French
- devtools/utils/chkproc: check that all functions defined
    in the netmagis library (common/libnetmagis.tcl) are
    effectively used
Remove unneeded file.

Followup to 89c2cf2e69adeb21db443c2259012f7ba8b7c216

When adding a directory as a whole, don't forget to
leave all vim sessions...