fix buggy attitude under watch, when combined with |head

[fgeorgatos]

not to solve it quickly, just reporting the issue here:

[fgeorgatos@ui qtop]$ watch -d './qtop.py -c|head -20'
close failed in file object destructor:
                                       sys.excepthook is missing
                                                                lost sys.stderr
[fgeorgatos@ui qtop]$ watch -d './qtop.py -c|head -20'
close failed in file object destructor:
                                       sys.excepthook is missing
                                                                lost sys.stderr
[fgeorgatos@ui qtop]$

[fgeorgatos]

no longer a problem, resolving!

[sfranky]

yes, watch is now incorporated into qtop via the -w switch