Some updates and fixes

Updates:

• Changed default settings for CalcCdrAAProfile
• Alternative (better) plotting for paired sample intersection stack area plot
• Added simple parser for ImSEQ software (https://github.com/lkuchenb/imseq)

Fixes:

• Correct frequency calculation for software that provides only by-read output (e.g. IMGT)
• Fixed bug in plotting Venn diagrams for 4 and 5 samples