Coding style should define variable order in the easyconfig

[gribozavr]

Currently the variable order is different in easyconfigs, but there are some patterns (for example, name, version, source URLs are on top). We should define a total order for consistency.

[stdweird]

one aim of the new easyconfig format PR is to have a proper easyconfig writer, so this will be fixed in near future

[fgeorgatos]

2 years and no joy;
IMHO, the exact order of directives should be the very one which implies the order of failure modes.
(ie. the sequence should appear "execution-like" - it IS more or less the current case, already!).

[migueldiascosta]

7 years, but who's counting :) easybuilders/easybuild-framework#2665 is probably an opportunity to look into this again