Refactor in-class osbasic.php into project OS class.

First step is to solve a minimal problem
Verify when the solution was made.
Add a variable and get the result.
Add constraints.
Complete implementation of Optimization Services
Fix UB/LB.
Split solution result out of solve, now must call getSolution().
,,
ss
Merge branch 'inclass' into topic-a6
dd
Merge remote-tracking branch 'official/master' into inclass

Conflicts:
	WCS/os.php
jj
revised