trim white spaces, make sure all doubles are declared with _mk

Mikkel Friis-Møllerrequested to merge
davidovitch:master into master

Created by: davidovitch

For consistency, make sure all doubles are of type _mk. Since HAWC2 is expecting all of the DLL IO to be of type doubles, only use doubles and do not use integers for status flags.

Since many editors auto trim trailing spaces (they are totally redundant), there are also a number of trailing white space "fixes".

@mhmdmirzaei, can you review this PR?

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