Fix escaping shell vars

Closes #46

See merge request !133

Apptainer support

See merge request !132

Make lb-run understand versions with 4 parts

Closes #44

See merge request !131

Allow --user-area to point to a nightly build slot installation

See merge request !129

Limit version of coverage for older versions of Python

See merge request !130

Support running aliases.sh with "set -u"

See merge request !128

Resolve "Preserve the trailing ':' in MANPATH"

Closes #42

See merge request !127

Bypass project lookup for projects coming from a nightly slot

Closes #39

See merge request !125

add support for nightly builds flavours in lb-run --nightly

Closes #41

See merge request !126

Detect exported functions with %%

See merge request !122

the lookup is extended to match
- $LHCBNIGHTLIES/slot/build_id
- $LHCBNIGHTLIES/flavour/slot/build_id
with the flavour defaulting to "nightly"

When requesting project version X.Y look for both X.Y and vXrY

Closes #38

See merge request !124

Fix crashes when using --path-to-project

Closes #37

See merge request !123

Since bash 4.4 functions have been exported with %% as the suffix instead of ():

https://github.com/bminor/bash/commit/3590145af6f1c9fa321dff231f69ae696e7e740b#diff-f6e7b8cbb34a38aef6fa9559192cbc0b873c68475cabfb90192bb43239efa00fR88

On aivoadm this causes an error message on login:

********************************************************************************
*                               ---- LbEnv ----                                *
********************************************************************************
 --- User_release_area is set to /afs/cern.ch/user/c/cburr/cmtuser
 --- CMAKE_PREFIX_PATH is set to:
    /cvmfs/lhcb.cern.ch/lib/lhcb
    /cvmfs/lhcb.cern.ch/lib/lcg/releases
    /cvmfs/lhcb.cern.ch/lib/lcg/app/releases
    /cvmfs/lhcb.cern.ch/lib/lcg/external
    /cvmfs/lhcb.cern.ch/lib/contrib
    /cvmfs/lhcb.cern.ch/lib/var/lib/LbEnv/2199/stable/linux-64/lib/python3.8/site-packages/LbDevTools/data/cmake
--------------------------------------------------------------------------------
-bash: export: `BASH_FUNC_which%%=() { ( alias; eval declare -f ) | /usr/bin/which --tty-only --read-alias --read-functions --show-tilde --show-dot "\$@" }': not a valid identifier

Improve cmt version detection by ignoring warning?

See merge request !121

On some machines cmt prints a warning before the version:

$ /cvmfs/lhcb.cern.ch/lib/bin/Linux-x86_64/cmt version
#CMT---> Warning: apply_tag with empty name [$(cmt_compiler_version)]
v1r20p20090520

Fix regression

See merge request !120