alterações $R.EXIST, xecute e createTable
nova classe
Merge branch 'refatoracao-mcontext-funcoesmumps' of https://github.com/viniciusinnovatium/mumps2java-api into refatoracao-mcontext-funcoesmumps

Conflicts:
	src/main/java/br/com/innovatium/mumps2java/dataaccess/DAO.java