1) Turn off opt_lowres if no javascript is active since it does nothing

for perl-generated pages (i.e. not implemented).
2) Properly store all lowres* options in %htmlOpts.
3) Don't even call createLowResolutionImage() if not opt_lowres - speedup
WebMagick twice.
4) Don't try to clean lowresdir and cachedir if they are not exists or
corresponding options are not turned on.
5) Don't try to create lowresdir and cachedir if corresponding options
are not turned on.
6) Read only first image from multi-image sequence such as animated GIFs
or MPEGs, lowres|cache image can't be created otherwise (they are not
exists after ->Write).

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