fix horrid indentation (someone used tabs inconsistently) add

[Linas Vepstas]

Log Message:
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fix horrid indentation (someone used tabs inconsistently)
add documentation
add copyright (hey I wrote this code in 1998, along with the rest
of the register code.  Someone stripped out the copyright along the 
way. Baadd).

Modified Files:
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    gnucash/src/register/ledger-core:
        split-register-layout.c
        split-register-layout.h