Support chaining of short switches

[nph278]

There should be an option to allow chaining of short switches.
e.g. passing -ab would be equivalent to -a -b

[Gragog]

I stumbled across this when I tried to implement an increasing verbosity level switch that can be specified multiple times to increase it. Like -vvv for "extreme verbosity". It's possible when specifying it multiple times separately, as in -v -v -v, but could be improved with short switch chaining as well.