lang/seed7: update to 05_20160531

Changes:

• Documentation comments have been added or improved in many files.
• The compiler (s7c) has been improved to start C compiler and linker direct and not via a shell (except when the compiler must be started with a script).
• The program chkccomp.c has been improved to use consecutive numbers for test program files.
• The program chkccomp.c has been improved to show the progress of the tests done.
• The experimental function startProcess, with files to redirect, has been added to process.s7i.
• The functions childStdIn, childStdOut and childStdErr have been added to process.s7i.
• The function shellParameters has been added to shell.s7i.
• The function noEmptyStrings has been added to seed7_05.s7i.
• A conv operator to convert an interface object to a specific implementation type has been added to seed7_05.s7i.
• The compiler (s7c) has been improved to support the new conv operator defined in seed7_05.s7i.
• In cc_conf.s7i the configuration values CC_OPT_DEBUG_INFO, CC_FLAGS, LINKER_FLAGS, SYSTEM_LIBS, SYSTEM_CONSOLE_LIBS, SYSTEM_DRAW_LIBS and SYSTEM_DB_LIBS have been changed to be arrays of strings instead of strings.
• In cc_conf.s7i the configuration values CALL_C_COMPILER_FROM_SHELL, CC_ERROR_FILDES, REDIRECT_FILDES_1, REDIRECT_FILDES_2 and NULL_DEVICE have been added.
• In cc_conf.s7i the configuration value REDIRECT_C_ERRORS has been removed.
• Interpreter and compiler have been improved to support the actions PCS_CHILD_STDERR, PCS_CHILD_STDIN, PCS_CHILD_STDOUT, FIL_PIPE and FIL_OPEN_NULL_DEVICE.
• The function analyzeProg in analyze.c has been improved to have less usages of the global variable prog.
• The functions in chkccomp.c have been changed to static functions.
• The program chkccomp.c has been improved to define POPEN_SUPPORTS_CLOEXEC_MODE, FOPEN_SUPPORTS_CLOEXEC_MODE, HAS_FCNTL_SETFD_CLOEXEC and HAS_PIPE2.
• The function filPipe has been added to fil_unx.c and fil_win.c.
• In fil_rtl.c the functions filOpen and filPopen have been improved to open files with the CLOEXEC flag, when possible.
• The function filOpenNullDevice has been added to fil_rtl.c.
• The functions init_findid, init_entity and init_sysvar have been changed to use a progType parameter.
• The functions pcsStart in pcs_unx.c and pcs_win.c have been improved to have parameters for stdin, stdout and stderr.
• The functions pcsChildStdErr, pcsChildStdIn and pcsChildStdOut have been added to pcs_rtl.c.

. The functions pcs_childStdErr, pcs_childStdIn and pcs_childStdOut

have been added to pcslib.c.

• In src/read_me.txt descriptions of SEARCH_PATH_DELIMITER.