fix: allowing for accounts containing whitespace (#86)

As [reported](snakemake/snakemake#2320), the
plugin will not deal with account names containing whitespace. (accounts
containing whitespace were not anticipated).

This PR is an attempt to fix this.

---------

Co-authored-by: Filipe G. Vieira <1151762+fgvieira@users.noreply.github.com>

snakemake_executor_plugin_slurm/__init__.py

@@ -375,7 +375,7 @@ def get_account_arg(self, job: JobExecutorInterface):
             # here, we check whether the given or guessed account is valid
             # if not, a WorkflowError is raised
             self.test_account(job.resources.slurm_account)
-            return f" -A {job.resources.slurm_account}"
+            return f" -A '{job.resources.slurm_account}'"
         else:
             if self._fallback_account_arg is None:
                 self.logger.warning("No SLURM account given, trying to guess.")
@@ -442,7 +442,9 @@ def test_account(self, account):
                 f"'{account}' with sacctmgr: {e.stderr}"
             )
 
-        accounts = accounts.split()
+        # The set() has been introduced during review to eliminate
+        # duplicates. They are not harmful, but disturbing to read.
+        accounts = set(_.strip() for _ in accounts.split("\n") if _)
 
         if account not in accounts:
             raise WorkflowError(