* module/ice-9/psyntax.scm (source-annotation): Only get source info
from syntax objects.
(strip): Don't attach source info.
(macroexpand): Don't proxy source info in that isn't in a syntax object.
(datum->syntax): Don't proxy source info from source-properties.
* test-suite/tests/compiler.test ("psyntax"):
* test-suite/tests/coverage.test (code):
* test-suite/tests/eval-string.test ("basic"):
* test-suite/tests/syntax.test ("expressions"):
* test-suite/tests/tree-il.test ("warnings"): Update tests that attach
source properties to use read-and-compile, or read-syntax.
* module/Makefile.am:
* module/ice-9/eval-string.scm: New module, for use in implementing the
scm_c_eval_string_from_file_line suggestion.
* test-suite/Makefile.am:
* test-suite/tests/eval-string.test: New tests.
