Add acceptanceResetFreq option to control files
When seed is not > 0, it should be based on clock
Add exit functions to Log
Clean up main.cpp; add a command-line processor
Add test of Node's constructor
Initialize _tipDescCount member variable in Node
Remove test executable from repository
Create test for CommandLineProcessor
Send the s.d., not the variance, to Random method
Provide better tree-reading error messages
Re-implement reading tree in Newick format

Previous implementation did not allow for tip nodes without a name.