- add new 'Csnippet' class
- rework 'pomp.fun' and plugins using S4 methods
- add capacity for handling C snippets to basic functions & plugins
- modify demo/sir.R and demo/gompertz.R to use new facilities
- remove 'obsnames', 'paramnames', 'statenames', 'covarnames' from 'pomp' class: transfer these to 'pomp.fun' class
- 'pomp.fun' is now a method
- remove separate documentation of 'pomp' class and 'mif' class.
- add support for compiled 'globals' to 'pomp'
- add support for prior distributions to 'pompBuilder'
- better commentary inside 'pomp'
- remove redundant error checking inside 'pomp' (make use of S4-class validation mechanisms)
- move linking operation inside 'pompCBuilder'
- random 'name' generation inside 'pompCBuilder' when name isn't supplied


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/pomp@930 edb9625f-4e0d-4859-8d74-9fd3b1da38cb