Allow ColorScale to use float values as well as integer

[cermak@…]

This is a simplistic hack to extend the SLD ColorScale rendering from
integer(atoi) to integer and float (atof) by detecting a period in the string
value.  This may need to be reworked to better support the programming style or
expanded to other sections of the SLD.  The standard suggests that it supports
doubles for input, but when you use Mapserver or Mapscript/PHP and dump the
rendered MAPFILE, floats are rounded to integers.  URL to patch against 4.8.3 is
there.  I checked CVS for version 4.10 to see if it was caught and that section
still remains the same.

[dmorissette]

*** This bug has been marked as a duplicate of 1914 ***