Compared to BCL1.1á, the following changes and enhancements have been made
to BCL13:

1. Added primitive for "else"
   Now both "if ... endif" and "if ... else ... endif" constructions are
   allowed

2. Added primitive for "version"
   Removed copyright message at startup
   Rather than having the copyright message on the screen each time you
   start BCL, it is now available "on demand" by executing the word "version"

3. Added "update" primitive
   It is now possible to replace the definition of old macros, variables,
   constants and primitives to correct mistakes, enhance the code, use
   libraries which operate on user defined functions, or create recursive
   macros

4. The BCL compiler now generates fully relocatable code, making memory
   management trivial (required for implementation of "update")

5. BCL.SRC now includes a definition for "initialize", which switches off
   stack display, clears the screen and displays the version. This is e.g.
   useful when you want to start BCL for program development rather than
   calculations: type "bcl std initialize"

6. Changed the word search order. The compiler finds the latest definitions
   first. Therefore, it is possible to create a new definition which overrides
   a previous one for future uses, although existing references keep referring
   to the original word (to change this, use "update").
   This is useful for testing a redefined word before "updating" it, or to
   create your personal definition of a word without affecting exisiting
   macros (e.g. for libraries).

7. At the end of the word list (use "list"), the number of words & bytes
   used & remaining are displayed.

8. PLOT.SRC is a library with function plotting and zero finding capabilities.
   Documentation can be found in PLOT.ADR.
   To use it, start bcl with "BCL PLOT" from DOS (you should have PLOT.BCL in
   your current directory).
   To recompile, use "bcl std noshow < plot.src"

9. Reformatted "bcl.adr" file for portfolio use

10. Added comments to pascal source code & included this source code in this
    release