removed a bunch of duplicate unneeded includes of std include files

Hg-commit: b6c9f3e2b0eb8b7277fe131cc83beede5d495522

source code need not include math.h since it is managed by the PETSc include files
a couple other unneeded included files also removed

Hg-commit: f47a2dda441cb818ab3be604570bccc0c8f15a89

Uncrustified src/sys/*

Hg-commit: 9f71677807bad7b55428a6cc0f5ccc5052e91805

Partially unified indentation to two spaces rather than 3, 5, etc.

Hg-commit: 72aceb82fa10cae79a777f91c00d187d4e02f4f6

Reformatting: 'No space after a '(' or before a ')''

Hg-commit: 797341a7bfba18bb97e6da668b36bad2e5977356

if, for, while, switch now have consistently a space prior to the opening parenthesis.

Hg-commit: cf69a5905ee4efb938b2bdd2762f87854175a6c5

Carefully removed \t from src/sys/*

Hg-commit: 910eecdb2d9101d15fb5ee24738d9e5eca423f9a