Add Jindrich Kubec's tools.

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diff --git a/jindroush/man/chkexe.rst b/jindroush/man/chkexe.rst
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+.. |version| replace:: 2.62
+
+======
+chkexe
+======
+
+------------------------------------------------
+check and/or disassemble Atari 8-bit executables
+------------------------------------------------
+
+.. include:: manhdr.rst
+
+SYNOPSIS
+========
+
+chkexe [**-gaps** *gap-size*] [**-silent**] [**-split**] [**-d**] **xex-file** [**output-file**]
+
+DESCRIPTION
+===========
+
+**chkexe** reads an Atari 8-bit executable (aka XEX file) and prints a
+list of segments, each with their start and end address. Run and init
+addresses are decoded.
+
+If no **output-file** is given, **chkexe** simply prints the results of
+its analysis. With an **output-file**, a possibly modified copy of the
+XEX file is created: Adjacent blocks (e.g. a block ending at $1FFF,
+followed by a block beginning at $2000) will be combined. The **-gaps**
+option can be used to control the threshold for combining blocks.
+
+OPTIONS
+=======
+
+**-gaps** *gap-size*
+  Blocks less than *gap-size* bytes apart will be combined. Default: *0*.
+
+**-silent**
+  Don't print informational messages.
+
+**-split**
+  Split multi-segment executables into one file per segment. The output
+  files will be called *blkNNNN.blk*, where *NNNN* is the block number in
+  hexadecimal. These files are standard Atari executables, with *$FFFF*
+  headers.
+
+**-d**
+  Disassemble each block. The disassembler is very simple: single pass,
+  no attempt to recognize data blocks.
+
+EXIT STATUS
+===========
+
+Zero for success, non-zero for failure.
+
+.. include:: manftr.rst