Raise an error when parsing a vobject that has mismatched `BEGIN` and
`END` lines (e.g., `BEGIN:FOO` followed by `END:BAR`) or missing `END`
lines (e.g., `BEGIN:FOO` with no subsequent `END:FOO`).
Fixes#1102.
the '_strategy_command' in 'fetchparams.cli' did not expand the path of
every argument, but only the first one (being the command to be
executed).
i fixed the '_strategy_command' function to apply the 'expand_path'
function to every member of the commands list.
Easy to confuse when skimming through the tree.
But the real reason (for me) is that the tab-completion is not very
useful when two files start with the same prefix.
