Merge pull request cs50#164 from cs50/develop

A few clarifications, fixes

Merge pull request cs50#152 from cs50/develop

2019 version

Merge pull request cs50#139 from cs50/soname

fixed soname

Merge pull request cs50#135 from cs50/style

updated style of cs50.c for consistency

Merge pull request cs50#129 from cs50/repo

cs50/repo

Merge pull request cs50#95 from cs50/develop

fixing -Wmissing-field-initializers

Merge pull request cs50#90 from cs50/develop

eliminates gnu11 dependency

Merge pull request cs50#83 from cs50/develop

v8.0.3

Merge pull request cs50#56 from cs50/globbing

fixes globbing

Merge pull request cs50#51 from cs50/remove-program_invocation_short_…

…name

removed program_invocation_short_name as unenlightening