Correct code error in last commit, adapt help text.

Compile and run on OS X O.K.
Clarify code comments.

No change to actual code.
Update .gitmodules

Point Submodules to forked copies on my account!
Merge branch 'master' into el-net1

* master:
  Update .gitmodules
  Clarify code comments.
  Correct code error in last commit, adapt help text.