Silent defaults on parse-errors

[vinjana]

At many places in Roddy, RoddyToolLib RoddyConversionHelper functions to parse integers, etc. are used. These methods are unsafe, because they catch all exceptions and instead return some default value.

1. Check all sites the methods are used, and verify, that the default value indeed is safe to use. Generally, require the user to properly configure Roddy, rather than best guessing some value.
2. Replace the sites where this is not the case, by a normal exception.