add focc usage in the user guide and fix tests

Akke Esa Tapio Viitanenrequested to merge
7-describe-focc-usage-in-the-documentation into feature_documentation

add focc usage in the user guide

add has_bh column

add test for has_bh column

fix bug in accessing star table length

remove silly debug logic from get_stars

increase test coverage to 100%

fix math formatting

re-write confusing maglim argument

Formerly, the maglim argument was used in the SQL query, and future calls would return this catalog. This can lead to unexpected behavior if maglim_new > maglim_old, since maglim_old would be the only one to take effect. The fix is to always download the full catalog and extract a magnitude-limited catalog from there.

Closes #7 (closed)

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