Merge pull request #83 from ggonnella/h-short

pls merge before big changes happen
Added missing assertion in GtSetSourceVisitor constructor
Merge pull request #84 from standage/master

Added missing assertion in GtSetSourceVisitor constructor
use gt_malloc() where possible
Merge pull request #85 from satta/mallocs

use gt_malloc() where possible
get rid of compiler warning (gcc 4.8.1)
Merge pull request #86 from gordon/master

get rid of compiler warning (gcc 4.8.1)
get rid of compiler warning

char doesn't have to be signed
Merge pull request #87 from gordon/master

get rid of compiler warning
move GtUword and GtWord definitions to types_api.h
define GtInt64 and GtUint64
unsigned long long -> GtUint64
long long -> GtInt64
redefine GtUchar
redefine and mark types as deprecated
do not use inttype.h and stdint.h in API header
update CHANGELOG
unsigned long -> GtUword
long -> GtWord
uint8_t -> unsigned char in API header