* src/SDCCast.c (decorateType): fix promotion of unary minus

* src/SDCCast.c (decorateType): fix promotion of unary minus
* src/SDCCsymt.c (computeType): beautified
* src/SDCCval.c (cheapestVal): beautified, old non-Ansi version removed,
(valUnaryPM, valComplement, valNot): fix sign and promotion
* support/regression/tests/uminus.c: speedup by removing superflous test case 'int'
* support/regression/tests/onebyte.c: added promotion and signedness tests for unary minus
* support/regressions/tests/bug-477927.c: disable warning about uninitialized variables

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@4015 4a8a32a2-be11-0410-ad9d-d568d2c75423