#134 License text clarification

[Wart]

A number of files in blt2.4z contain a reference to the standard Tcl 'license.terms' license file. However, license.terms is not included in the source distribution.

I suspect these files were probably supposed to be licensed with the MIT-style license similar to the rest of the files. It would be good to fix these files so that the license text is consistent across the package.

Files that refer to license.terms:

./src/bltWinDde.c
./src/bltWinPipe.c
./src/tkFrame.c
./src/tkScrollbar.c
./src/bltObjConfig.c
./src/bltWinMain.c
./src/bltScrollbar.c
./src/tkMenubutton.c
./src/tkConsole.c
./src/tkButton.c
./src/bltHash.c
./src/bltObjConfig.h
./src/bltUnixPipe.c