[Patch] support for project specific help-module command

[Ralf Habacker]

Hi,

the appended patch extends cmake so that it is able to search cmake 
modules based on the current root dir (subdirectory cmake/Modules)  and 
if in the current directory is a CMakeCache.txt also in the related 
source root.

There may be additional usefull features in cmake like extending the 
help-module-list command to list all available modules or extending the 
help-command[list]} command with project specific macros, but those are 
not covered by this patch.

Regards
Ralf


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