Possible new feature (postinstallpatches)

[damianam]

There are some software packages that require to change/create files once the installation is done. This can be currently handled by:

• Custom easyblocks
• postinstallcmds
• Patching the source so the install step accounts for the appropriate changes

A feature such as postinstallpatches could be convenient in these cases, to create/modify files that have been already installed. For instance, to create a wrapper or a script. In some cases it could help to minimize the amount of easyblocks.

Opinions? @boegel @ocaisa ?

[boegel]

makes sense to me, and shouldn't be too hard to implement support for

[AndiH]

I also think this would be useful. I certainly need it now :/.

[branfosj]

Done in #3974