search.py: tidy up

Signed-off-by: Adrian Negreanu <adrian.m.negreanu@intel.com>
trailing space

Signed-off-by: Adrian Negreanu <adrian.m.negreanu@intel.com>
config: SOURCE_BROWSER_ONLY

When set to YES, the new config option,
will only generate the highlighted sources.
Information is provided through SOURCE_TOOLTIPS

It helps if you only use doxygen as a source browser and want
a to have a quicker html output.

Tested on libdrm:
SOURCE_BROWSER_ONLY = NO
  Elapsed (wall clock) time (h:mm:ss or m:ss): 0:14.27
  9285 files in html dir

SOURCE_BROWSER_ONLY = YES
  Elapsed (wall clock) time (h:mm:ss or m:ss): 0:02.65
  717 files in html dir

Signed-off-by: Adrian Negreanu <adrian.m.negreanu@intel.com>
config: add SOURCE_TOOLTIPS_URL

Signed-off-by: Adrian Negreanu <adrian.m.negreanu@intel.com>
dynsections: use search.cgi to fill in the source tooltips

Signed-off-by: Adrian Negreanu <adrian.m.negreanu@intel.com>