Echo can interpret operand as an option and checking every variable to
be echoed is troublesome while with printf, if the format specifier is
present before the operand, printing as string can be enforced.
Script to source muttrc configuration is preferred as it can choose what
files must exist and not throw extraneous error messages on optional
files. Adding the example configuration files to slim out the readme
from the qusal project, also helps with copying the file from inside
the qube itself instead of having to copy inter-qube.
