Categorize TLSANL problems

[touwwouter]

Parse tlsanl.log

[touwwouter]

• We may want to show outliers listed in the first section of the skttls report if tlsanl ran successfully:

####     SKTTLS SUMMARY     ####

#  Total number of bonds between residues:                    205
#  Number of bonds beyond 95th percentile for any residual:     0
#  Number of bonds beyond 99th percentile for any residual:     0

• We may want to be able to tell why tlsanl ran unsuccessfully (e.g. because of tls group definitions).

[touwwouter]

We won't parse tlsanl.log errors as they all originate from errors in the PDB file (as usual). TLS group definition problems can raise different TLSANL errors, but we group them under the same category.