Rename member variable "n" to "len"

Describes the _length_ of the array, not the number of elements.
Rename member variable "next" to "num"

Describes the number of elements of the object.
Fix variable name for command number in processor code
Fix variable names in tests
Merge pull request #329 from matthiasbeyer/fix-variable_names_transaction

Fix variable names in transaction type
Add initial interface of config loading utility
Add function for testing variants
Add convenience function for open()ing the config file
Add implementation of ws_config_load()
Read config file from main()
Make connector return EOF if it hits the end of file
Rewrite error detection logic in command processor