Fix spaces in source
Fix tabs in source (fossil support)
Support for counting screen sessions with parameters

In some cases (multi user enabled in screen for example), the count of
detached screen sessions was incorrect. The command to locate these has
been improved using a more tolerant regex, which also makes sure the
"Detached" word appears inside a parenthesis (so it's not an attached
screen to a machine called Detach for example).
screen: stricter matching in detached sessions counting
Temperature/Linux: fetch using "acpi -t"
_lp_temp_acpi: handle multiple temperature sensors (multi CPU)
_lp_temp_*: get result through variable instead of stdout
Merge branch 'fix-typos' of https://github.com/nicolas17/liquidprompt into develop

* 'fix-typos' of https://github.com/nicolas17/liquidprompt:
  Fix typos in README and CONTRIBUTING.
Correct LP_OLD_PROMPT_COMMAND behavior.
Some changes in temperature processing.
Merge branch 'develop' of github.com:anthonygelibert/liquidprompt into develop

* 'develop' of github.com:anthonygelibert/liquidprompt:
  Correct LP_OLD_PROMPT_COMMAND behavior.