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- Also makes other minor Markdown fixes that were near the main fixes.

The Unicorn master resets any signal handlers and prevents rbtrace
from working properly as a result. Move the `require 'rbtrace'` call
to the Unicorn `after_fork` block and keep the initializer only for Sidekiq.

This will be enabled if ENABLE_RBTRACE environment variable is defined.
This will allow us to debug all sorts of issues in production:

https://github.com/tmm1/rbtrace

[ci skip]

iFoo

Correct the command to get a gdb backtrace from all threads. `apply` is
not a valid gdb command.

See https://sourceware.org/gdb/onlinedocs/gdb/Threads.html#Threads .

[ci skip]

[ci skip]

This reverts commit 13e37a3e.

Also add command to turn off pagination

[ci skip]

This reverts commit 3e991230.

# Conflicts:
#	app/models/project.rb