Return of the ZipCache now using last modified time.
Treat jars as zips in ZipCache which maintains an cache of all ZipFiles accessed via Pathname jars (which should be the entire system as Load now uses Pathname). ZipCache currently does not invalidate entries for any non-file resources due to deficiencies in the JVM that need to be corrected on a per-protocol basis. For instance, for HTTP we need an implementation that uses HTTP HEAD requests to get the Last-Modified header as opposed to re-fetching the entire resource as the JVM URLConnection does. SYS:REMOVE-ZIP-CACHE-ENTRY implements a way to invalidate ZipCache entries from Lisp. Used it in COMPILE-FILE to successfully recompile FASLs under Windows. Rewrite remaining Pathname Primtives in the informative stack trace style. Implement Debug.warn() which can be shut off with SYS::*DEBUG-WARN*. The intent here is to have a way to warn about Java side events which having potentially worrying side-effects during development which is by default not visible to end users (although it can be). Removed unused EXT:LAST-MODIFIED in favor of existing ANSI FILE-WRITE-DATE.
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