3.4.0 - pfscale + bugfix accessibility constraints

IntaRNA

• new arguments t|qPfScale for sequence-specific ViennaRNA pf_scale parameter used
  to scale partition functions for ED value computation to avoid overflows
• BUGFIX : when using sequence subset selection in combination with precomputed
  accessibilities from file, wrong accessibilities were loaded for the selected
  sequences
• BUGFIX : seed-extension-based predictions (default prediction mode) were not
  heeding accessibility constraints
• BUGFIX : query accessibility constraints were applied in reversed indexing