Before edit of second draft
modified:   report.tex
modified:   todo.txt
Draft 2: Starting drawing bit of Milan's corrections.

Makefile - added bib compilation
block_preconditioning_framework.tex Up to milan's drawing bit.
lll script to compile and open the pdf.
report.tex - added bib entries
Drafting 2: Up to explaining block types
Added ,gitignore
Still doing 2nd draft milan

Doing section on Master and subsidiary preconditioners.
2nd draft, Milan correction, writing simple diagonal block
preconditioner.