Started IO for contexts
Started IO for contexts

By now we can read and write contexts in Burmeister format (but the
implementation is bad).

Signed-off-by: Daniel Borchmann <25857343a15bf1edafebc2912e82ecf775c585c1@mailbox.tu-dresden.de>

fcatools/conexp-clj,fcatools/conexp-clj,Lobage/conexp-clj,exot/conexp-clj,exot/conexp-clj,exot/conexp-clj,exot/conexp-clj,exot/conexp-clj,immo/clojure-conexp,Lobage/conexp-clj,fcatools/conexp-clj,Lobage/conexp-clj,immo/clojure-conexp,Lobage/conexp-clj,fcatools/conexp-clj,fcatools/conexp-clj