Improve robustness of release creation scripts

[bo0ts]

Currently three scripts are involved in the process of creating releases:

• Scripts/developer_scripts/create_internal_release
• Scripts/developer_scripts/create_new_release
• Maintenance/infrastructure/cgal.geometryfactory.com/bin/create_release

The third scripts kicks-off the whole process, create_new_release sets up the correct branch, and create_internal_release does the dirty work. All three scripts still contain references to svn, the old doc tools and have a habit of not checking return values. They could do with an overhaul to make it easier for developers to understand this process and to make them easier to maintain.

[sgiraudot]

@lrineau what do you think of this issue?

[lrineau]

I do agree with Philipp (@bo0ts). But we do not have the manpower to improve or rewrite those tools. There was some hope, in a branch started by Philipp (see #23) but the branch was including two different features, he left before both features were ready to be integrated. (@sloriot is also somehow involved in #23.)

[sloriot]

Things are improving with the removal of dont_submit files. We are one step closer to generate the release with cmake directly.

[lrineau]

For the records: the removal of dont_submit files was #1446.