Cleaning the source code

[illwieckz]

Hi, the current code is very old so it's naturally messy and do not follow coherent guidelines.

For example code indentation use 4-spaces per level, but comment indentation use tab and sometime tab are expected to be 4-space long and sometime 8-space long.

There is a new guideline for code: https://www.freebsd.org/cgi/man.cgi?query=style&sektion=9
But the current code does not follow them yet.

Also, it could be very good to split the too-big qstat.c and qstat.h files, and perhaps some directory structures to store them, currently all is stored on the repository root directory, why not a src/ directory?

Nobody loves whitespace commit, but every one loves good-looking code, since qstat is not very forked yet, it's the good time to do it, no?

[stevenh]

A white space cleanup would be good. Personally I don't have time ATM, but I'm totally willing to accept a pull to achieve that.