Trimmed base percentage not correct for long read alignments

[jakobmatthes]

Calculation of trimmed base percentage assumes that all (most) alignments have the same length. For long read data, this is not valid. Reported trimmed base percentages are very high.

ngs-bits/src/cppNGS/Statistics.cpp

Line 904 in 9e19e7a

bases_trimmed += (max_length - al.length());

ngs-bits/src/cppNGS/Statistics.cpp

Line 996 in 9e19e7a

addQcValue(output, "QC:2000019", "trimmed base percentage", 100.0 * bases_trimmed / al_total / max_length);

[leonschuetz]

Does this parameter even make sense for long-read data? Because there is no adapter trimming (so far).
Should we simply remove it for long-reads?