Setting the max value of procedure running simultaneously to 1

Update proc_runtime_instructions_FreeRTOS.c

Merge pull request #8 from discosat/dsl_proc_exec-mem-leak

refactor and fix memory leak in dsl_proc_exec

ensure operand enums are 1 byte

Merge pull request #7 from discosat/reserved-procedure-slots

add support for reserved/pre-compiled procedures

Merge pull request #6 from discosat/dynamic-store-lazy-allocation

allocate memory lazily in dynamic proc store

Merge pull request #5 from tobiasfrejo/array-access-fix

Merge pull request #4 from discosat/posix-runtime-build-error-fix

Fix calculation for removing index in param name

Work on copy of param name to avoid strtok induced side-effect

Make recursion_depth_key extern to fix multiple definitions error when building with POSIX and runtime

Merge pull request #3 from discosat/parameterize-mem-related-vals