E.g.:
<pragma-> show testcargs
<PBot> [global] testcargs: /code c11 printf("/say args: " ); while (*++argv) printf("[%s] " , *argv);
<pragma-> testcargs 'hello''world' 'how are 'you today
<PBot> args: [helloworld] [how are you] [today]
Previously, adjacent 'foo''bar' would end up as 2 args like [foo] [bar]. Now
they are properly concatenated into one [foobar] argument.
This also fixes the cases of whitespace being inserted after quoted arguments.
