Changed the type of the result of the ! (NOT) operator to char;

Changed the type of the result of the ! (NOT) operator to char;
previously it returned the same type as the source. This allows
us to eliminate all the genFloatNot functions (all of its target
implementations were very buggy) since !float can use the same
code as !long now.

* src/SDCCicode.c (ast2iCode): ! returns char
* src/mcs51/gen.c (genNot, genNotFloat),
* src/ds390/gen.c (genNot, genNotFloat),
* src/z80/gen.c (genNot, genNotFloat),
* src/pic/gen.c (genNot, genNotFloat),
* src/pic16/gen.c (genNot, genNotFloat): eliminated genNotFloat

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@2839 4a8a32a2-be11-0410-ad9d-d568d2c75423