BUG FIX: Copy paste the relevant code from tools::R_user_dir() into config_file_location() to ensure
that qsub works with older versions of R.
TESTING: Skip test on CRAN which might result in the creation of the cache dir as specified by R_user_dir if it did not already exist.
BUG FIX: Surround readRDS() with tryCatch() such that if there is an rds object but it is
truncated, qsub handles this as if there was no file at all.
MINOR CHANGE: config_file_location() now uses tools::R_user_dir() to determine the path of the config file.
MINOR CHANGE: There is now an option to compress the output files, which is turned on by default.
MINOR CHANGE: Allow unix systems to use rsync instead of cp for fetching the qsub output.
BUG FIX: Fix qsub_retrieve() when processing the output; it did not take into account that
batch_tasks could not be equal to 1.
MINOR CHANGE: qsub_retrieve() now uses pbapply when loading in the output.
BUG FIX: Test ssh connection pointer before using it.
BUG FIX: Do not remove the first line of an error file.
MINOR CHANGE: Use absolute paths to output standard output and error logs (#16, suggested by @mmehan).
MINOR CHANGE; Allow rsync to also use the username@host:port notation (#16, suggested by @mmehan).
qsub command.