Implement #+ and #- reader macros
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gnu/commonlisp/testsuite/lang-test.lisp: Add tests for features, #+, and #-.
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gnu/commonlisp/lang/CLReadTable.java: New file. (CLReadTable): Moved here from CommonLisp.java (SharpPlus): The new readtable entry for #+.
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gnu/commonlisp/lang/CommonLisp.java (features): New. Holds features. (initLisp): Register and initialize features.
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source-list (GNU_COMMONLISP_LANG_JSOURCES): Add CLReadTable.java.