Truncate long unit numbers to conform with billing format

Tidy code and make more readable. Remove debugging

RfC690 - comment test request numbers

RfC690 - prevent duplicate billing of HTS myeloid only requests when more than 1 sample type submitted

RfC673 - add trial ID to activity data file

speeling corections

RfC524 - change PNH screening terms; fix error in ncg_pnh.pl HTS count query - incorrect 'group by' with COUNT(*)

Set file executable again (no idea why it changed)

improve documentation and name change

RfC466 - amend billing rules to supply single specimen type for requests screened as HTS myeloid only

RfC448 - amended FLAIR trial billing rules

activity_data.pl - move duration and testing settings to command-line args (as I forgot to reset JUST_TESTING to 0 this month)

add source name to unknown/unwanted locations in activity data email

request lab-test history logs results input/update/delete actions; bugix to .t following recent .tt format changes

fixed slow running query due to position of th.action & rh.action in SQLA::More - see http://scsys.co.uk:8007/559045 and https://metacpan.org/pod/SQL::Abstract::More#Join-specifications; rearranged order of events in apply_local_rules in view of creation of new row for BMASEQ sample type (pushing on @rows skips any subsequent rules)