.gitmodules has invalid/stale entries and git:// remotes (submodule init can break)

[fcotizelati]

While reviewing .gitmodules, I found some inconsistencies that can break or confuse git submodule workflows:

1. Invalid stanza for pyBurstAnalysisGUI:

[submodule "src/pyBurstAnalysisGUI/"]
branch = master

This entry has no path or url, so it’s not a valid submodule definition. See .gitmodules:124.

2. Stale/wrapper entries and missing paths:
   .gitmodules declares submodules for wrapper or missing directories, e.g. externals/gsl, externals/gsl_module/gsl, externals/cppunit, externals/clhep, resources/clhep/clhep, src/evtUtils. This can cause git submodule update --init --recursive to try to init submodules that aren’t real gitlinks or don’t exist. See .gitmodules:115, .gitmodules:126, .gitmodules:129, .gitmodules:141, .gitmodules:144, .gitmodules:150.

3. git:// remotes:
   Some entries use git:// (e.g., GSL). These are frequently blocked on locked-down networks; https remotes are more reliable.

Suggested fix:

• Remove or repair the invalid pyBurstAnalysisGUI stanza.
• Remove stale/wrapper entries or convert them to proper nested submodule entries only where needed.
• Replace git:// remotes with https:// equivalents.
• Ensure .gitmodules reflects the actual submodule layout present in the repo.

[jasercion]

Thanks for this very thorough report - I'll look into this today and work on making the necessary changes.