Test to ensure that sTHROW works inside sCATCH.
Make skit_stream_stdout/in/err be indented streams by default.
parsing/peg module allows the generation of parsers using Parsing Expression Grammars (PEGs) based on C macros.
Fixed bug that caused indented formatted prints on ind_streams to produce garbage.
skit_loaf_append_cstr and skit_loaf_append_slice now handle null values.