made timer ticker registering more robust. Search env var dirs before install dirs for dyn modules. change default dyn module install dir to lib/cyclus instead of lib/Models
made timer init method not reset previous timer config (e.g. listeners) - this caused confusion and debugging for me in the past
fixed some gcsg issues and a typo
change module install dir to not be split into separate fac, reg, inst subdirs. Still need to fix schema building and env class and dynamic_loading class correspondingly.
made Env::ListModules more robust and include CYCLUS_MODULE_PATH env var dirs in search. Made BuildMasterSchema not care about model type namespacing subdirs.
Merge pull request #619 from rwcarlsen/module-install

change module install dir to not be split into separate fac, reg, inst subdirs