Changes in LOGEX 2R4C

 - Allow relative day in date part of start & end dates.
 - Allow exclusion of types 71-72 & 106 if Z option.
 - When including runids (@LOGEX,R), don't include other non-matching ones.
 - Even if selecting a timestamp range, include all initiation and continuation
   106 types to avoid ?????? in the runid field if viewing output with ZIP.

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 Changes in LOGEX 2R4B

 - Enhance K-option snapping to include Audit Media Trailers, Fillers, End
   Sentinels, and the last word of each block, which normally contains a block
   sequence number (Audit Block Trailer).
 - Enhance K(w/o H) & E-option snaps: show each block's 1st & last entry seq. #
 - Suspend checking for block sequence numbers; will not terminate if mismatch.
 - Avoid @FREE of temp input file if system parameter REJCONFLTOPT is TRUE.
 - If neither start nor end log cycle specified, assume -1 for both.
 - Fix bug that was causing merging to error.
 - Ensure end time >= start time.
 - U option eliminated; unused cycles never listed anyway.

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 Changes in LOGEX 2R4A

 - Improve format of individual file cycle summary lines.
 - Clarification on individual file entry totals: These are "significant"
   totals; i.e., either all entries if no inclusions or all entries found by
   matching one or more of the included items (type, runid, account, userid,
   program @XQT, or QUAL*FILE). Run initiation entries (type 106), which
   contain a thread ID to identify the run, are included in a cycle's entry
   totals if there are no inclusions, or if they had a match for an included
   runid, account, or userid. The other system information entries (71-74,
   106/3-4) are not counted when there are inclusions.

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 Changes in LOGEX 2R4

 - Allow output block size of up to 65520. Will switch to single- vs.
   double-buffered I/O for output if block size greater than about 44600.
 - If output block size 2 is coded, use maximum size for double-buffered output.
 - If there are inclusions (runid, type, userid, etc.), entry totals for
   individual files will reflect all entry types except 71-74.

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