* documentation: reworked packaging guide to add build-system phases
* documentation: improvements to AutotoolsPackage autodocs
* build_systems: updated autodocs
* run-tests: added a few information on how to run tests fixes#2606 fixes#2605
* documentation: fixed items brought up by @davydden
* typos in docs
* consistent use of 'build system' (i.e. removed 'build-system' from docs)
* added a note on possible default implementations for build-time tests
* documentation: fixed items brought up by @citibeth
* added note to explain the difference between build system and language used in a package
* capitalized bullet items
* added link to API docs
* documentation: fixed multiple cross-references after rebase
* documentation: fixed minor issues raised by @tgamblin
* documentation: added entry in table for the `PythonPackage` class
* docs: fixed issues brought up by @citybeth in the second review
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