CVS Commit by dpage: Look for a path 'hint' on Windows.

Log Message:
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Look for a path 'hint' on Windows. This registry setting may be set by the Win32 PostgreSQL installer which will
generallyinstall pg_dump et al. in the PostgreSQL bindir rather than the pgAdmin directory. 

Modified Files:
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    pgadmin3/src:
        pgAdmin3.cpp (r1.105 -> r1.106)