During a copy/sync command, if an operation fails due to a network
issue and is retried, the underlying io.Reader is re-initialised,
but the stats for bytes already read are not reset, leading to incorrect
stats. THis was fixed by resetting the bytes read when an Account is
re-initialized.
--files-from parses input files by ignoring comments starting with # and ;
and stripping whitespace from start and end of strings.
The --files-from-raw flag was added that reads every line from the file ignoring
comment characters and not stripping whitespace while maintaining
backwards compatibility.
Fixes#3762