* backtrace.c, debug.c, eval.c, eval.h, gsubr.c, read.c,

* backtrace.c, debug.c, eval.c, eval.h, gsubr.c, read.c,
srcprop.c, srcprop.h (scm_i_filename, scm_i_line, scm_i_column,
scm_i_copy, scm_i_name, scm_i_lambda, scm_i_source, scm_i_more,
scm_i_procname, scm_i_dot, scm_i_arrow, scm_i_else, scm_i_unquote,
scm_i_uq_splicing, scm_i_apply, scm_i_enter_frame,
scm_i_apply_frame, scm_i_exit_frame, scm_i_trace, scm_i_quote,
scm_i_begin, scm_i_if, scm_i_and, scm_i_or, scm_i_case,
scm_i_cond, scm_i_letstar, scm_i_do, scm_i_quasiquote,
scm_i_define, scm_i_letrec, scm_i_let, scm_i_atapply,
scm_i_atcall_cc, scm_i_breakpoint): Renamed: Consequently use
scm_sym_ as prefix for symbols.

* eval.c, eval.h (scm_sym_begin, scm_sym_if, scm_sym_and,
scm_sym_case, scm_sym_cond, scm_sym_letstar, scm_sym_do,
scm_sym_define, scm_sym_letrec, scm_sym_atapply,
scm_sym_atcall_cc): Made global.