the -mininput argument doesn't work

[dooglus]

We have text saying:

"  -mininput=<amt>        " + _("When creating transactions, ignore inputs with value less than this (default: 0.01)")

but -mininput isn't used to set nMinimumInputValue anywhere in the code, so the setting does nothing.

[dooglus]

My bad - it is used, just the default isn't set like the documentation string says it is.

I'll make a different issue for that because I can't edit the title of this one.

Edit: it's #177.