missing that files_to_copy supports copying from a src directory to a dst directory

[ysagon]

The documentation about files_to_copy is missing the fact that we can specify a tupple for src/dst copy.

https://docs.easybuild.io/version-specific/generic-easyblocks/#extra-easyconfig-parameters-specific-to-makecp-easyblock

Example: files_to_copy = ['bin', (['tools'], 'bin')]