Merge pull request #216 from joergi-w/hiwi

gt encseq info: tests for n50 values and bugfix for n50_sum
small changes to make-scripts
add Markovsky files to targets
add GtArrayGtUword
add assertion
cosmetics

coding convention, added missing header, update some documention
rename and add funktion for alignment length
gt_alignment_show formats to a given width
allow to disable flock(2) with GT_NO_FLOCK
ref feature nodes coming out of GtFeatureInStream
fix test cases for GtFeatureInStream

Ownership of the test nodes needs to be held by the
feature index to mimic the effects of a feature out stream
pull.
Merge pull request #231 from gordon/noflock

allow to disable flock(2) with GT_NO_FLOCK
Merge pull request #227 from Garonenur/alignment_show

Alignment show
Merge pull request #232 from satta/daniel-streams

ref feature nodes coming out of GtFeatureInStream
optimize editscript
fix gcc uninitialized error
Merge pull request #228 from Garonenur/editscript

Editscript
change in GtSeqabstract and xdrop using these
fixes and cleanup in unique encseq, moved to devtools
fix memleak