K 10 svn:author V 3 bde K 8 svn:date V 27 2016-08-15T19:37:18.802648Z K 7 svn:log V 468 Restructure the grabbing functions into mere wrappers of new open and close functions. Scattered calls to sc_cnputc() and sc_cngetc() were broken by turning the semi-reentrant inline context-switching code in these functions into the grabbing functions. cncheckc() calls for panic dumps are the main broken case. The grabbing functions have special behaviour (mainly screen switching in sc_cngrab()) which makes them unsuitable as replacements for the inline code. END