Deprecate GtFeatureStream, replace with GtFeatureInStream

Simply doing a typedef of gt_feature_in_stream_new to gt_feature_stream_new was gave the desired functionality, but did not generate the desired (HTML) documentation. Thus the trivial constructor implementation.
Merge branch 'master' of https://github.com/genometools/genometools
Merge branch 'master' of https://github.com/genometools/genometools
use _mktemp if _mktemp_s is not available

strangely _mktemp_s is not always available, use _mktemp as a replacement for
now to enable testing on the GenomeTools server
Merge pull request #71 from gordon/windows

use _mktemp if _mktemp_s is not available
Merge pull request #68 from standage/master

Deprecate GtFeatureStream, replace with GtFeatureInStream
use defined (_LP64) || defined (_WIN64) everywhere
Merge pull request #73 from gordon/windows

use defined (_LP64) || defined (_WIN64) everywhere