Changed lots of PHP 3 licence headers to PHP 4, mainly in .h files.
Added a few RCS $Id$ tags.

# Note: I have avoided changing any .h files if the corresponding .c file
# had not alr

Changed lots of PHP 3 licence headers to PHP 4, mainly in .h files.
Added a few RCS $Id$ tags.

# Note: I have avoided changing any .h files if the corresponding .c file
# had not already been changed as I am not sure if there are any legal
# issues here. So some extensions still have PHP 3 headers.

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Rename macros which begin with underscore to appropiate macros. The general
rule is:

macro_name=`echo $filename|tr a-z A-Z|sed 's/\./_/'`

Include <math.h> in php_math.h. This is necessary, because we might
otherwise redefine system macros.

Rename phpmath.h to php_math.h.