coding style
remove gt_prefix for local names
`gt sequniq`: Do not filter out "palindromic" seqs

Before that a sequence which equals the reverse complement of itself was
filtered out.

Closes #438
Merge pull request #443 from gordon/sequniq

`gt sequniq`: Do not filter out "palindromic" seqs
default 64bit compilation, touches genometools/genometools#442
correctly handle platform error in rdj assembly
add 32bit=yes to INSTALL instructions,
error message for contradictory parameters,
touches genometools/genometools#444
Merge pull request #441 from ggonnella/readjoiner_32bit_error

correctly handle platform error in rdj assembly
Merge pull request #444 from joergi-w/hiwi

default 64bit compilation