Next step in #89: checkSDCARD in Run.java, get*Path in top half

Clean up stale imports
Run.checkSDCARD(char) adds RunTimeError to Basic.checkSDCARD(char)
checkSDCARD in executeRENAME, DELETE, FILE_EXISTS, FILE_SIZE,
 FILE_ROOTS, GRABFILE, and sql_open
getDataPath in same except execute_sql_open, plus
 executeTEXT_OPEN, BYTE_OPEN, BYTE_COPY, MKDIR, DIR,
getDataBasePath in execute_sql_open
getSourcePath in executeRUN
In execute_sql_open: don't check SDCARD for db in memory
In executeRUN: add checkEOL, add RTE if file not found
In executeNOTIFY: isNext and getStringArg to shorten and add checks