[MACTCL] Bug in tk_getSaveFile on OSX

[Tony L. <to...@me...>]

tk_getSaveFile doesn't accept unix-style pathnames.

() 5 % tk_getSaveFile -initialdir /
bad directory "/"
() 6 % tk_getSaveFile -initialdir :         -- works fine
() 7 % tk_getSaveFile                       -- works fine

Note that the 'pwd' and 'file join' commands both use /

() 11 % pwd
/

() 12 % file exists /
1

-Tony
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