Resolved an issue with magic crashing during "antennacheck" due to

a routine that should have been called with a NULL argument, but
instead was called with no argument, making the behavior system-
dependent.  Revised the parsing of the "defaultareacap" and
"defaultperimeter" statements in the tech file, such that the short
version of both statements gets automatic handling of the substrate
and isolated substrate areas;  this goes back to the recent change
in extraction behavior to redefine the "substrate type" (e.g., pwell)
during extraction as defining isolated substrate areas, and not the
default substrate.  The earlier code change dealt with problems
related to extracting nodes and regions, but did not consider how
parasitic capacitance was affected.  This commit resolves that issue.

utils/main.h

@@ -93,7 +93,6 @@ extern Transform RootToEditTransform;
 /* global procedures */
 
 extern void MainExit(int);	/* a way of exiting that cleans up after itself */
-// These are not declared anywhere
-// extern bool MainLoadStyles(), MainLoadCursors();  /* Used during init & reset */
+extern void magicMain();
 
 #endif /* _MAIN_H */