Reworked …

[hmueller01]

... arithmetic.c, client.c, io.c, parser.c, socket.c, unit.c, vclient.c, vcontrold.c, xmlconfig.c

• Fixes some more minor flaws.
• Globals should be before any code and not hidden somewhere in the middle ...
• return always without () (no function ...)
• No code before variable declaration
• Empty line after variable declaration
• No empty line before case ...: (to be consistent)