add example for gaussian 1d models
fix member and parameter types
allow swap engine for float float swap instrument
fix nominal threshold and guess for calibrating swaption's maturity
remove debug line
Use old version of boost::timer.

I'd like to use the new version (in the other examples, too)
but it was first released in version 1.48, and we're still
supporting versions from 1.39 onwards.
Add possibility to not wait for user input.

This is used in `make check-examples`.
Ignore new artifact
Add VC++/Dev-C++ projects.
Merge pull request #94.