SCUBA2: fix typo in list

A stray full stop made its way into the list causing two of the
elements to be concatenated rather than being treated as separate.
(cherry picked from commit 00bc1dbaae216b0d4587178beb8c563d9a799bcf)
PICARD: push files onto Frm intermediates for quieter deleting

When calling _DELETE_TEMP_FILES_ with VERBOSE=0 and ALSOGRP=1, messages
about deleting Frame-based intermediates are suppressed, while those
pertaining to Group-based intermediates are not.

There can be a lot of aligned files from this primitive which should
be deleted, but it's distracting and unecessary to have the recipe end
with 100+ messages about deleting intermediate files which the user
didn't know existed and doesn't care about.
(cherry picked from commit 894265374a57122bdb28eba185d5e217e84768b0)
SCUBA2: ensure an even numbe of images is used in creating jack-knife
(cherry picked from commit c6b6870c6718ca2f15bd9fb479562edeb5a36da9)
PICARD: issue a more helpful error message if no flux given
(cherry picked from commit ce047f26194c7eae916a60cd6324969e57eed94b)
PICARD: add THRESH recipe parameter
(cherry picked from commit 989453fe1213b72a1af3cc24fe85e0e32bfa46a6)
SCUBA2: back out attempts to trap closed-dome tests

This heuristic attempt to trap closed-dome tests skipped good data
more often than genuine closed-dome data due to the unreliability of
the WVM. Remove these checks for now and allow makemap to fail
(usually with the SMF__INSMP error) if the data are taken with the
carousel doors closed.
(cherry picked from commit 7fec7887d615f324a2f04fc6d7fa64915b0f8e0e)
PICARD: warn or quite for small numbers of bolometers in map

Maps made with very few bolometers are usually not good enough to
detect the source and may have other issues. Issue a warning if the
number of bolomters is between 50 and 100 (kind of arbitrary I
suppose), but terminate with an error if less than 50.
(cherry picked from commit 5972012c706ec6aa9fb3db2fd0f68bbacbb0e0e0)
SCUBA2: trap null results and issue warning/error

When aperture photometry fails, the sum can still be defined but with
meancount and meanerr both being 0, the subsequent calculations will
fail. So protect against divide-by-zero and issue an error if
meancount is 0.
(cherry picked from commit f1fbdb967664796f1b6cb911cd2d9a1ef3b944d8)