fix typo in README, and use tabs instead of spaces in main Compose file

Merged Benno Schulenberg requested to merge benno/libx11:whitespace into master

The first patch fixes a missing word and a typo in the README.

The second patch replaces all runs of spaces with tabs in the main Compose.pre file, thus reducing the file size with 37 kilobytes.

The third patch makes some manual adjustments to the alignment of several blocks of compose sequences, for a less messy look.

Edited by Benno Schulenberg

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