Fixed: use \omega to indicate scenario, not i
Restructured introduction to generalized network model

(1) Introduced sets of nodes and arcs (N,A)
(2) Moved definitions of variables above model statement.
(3) Added appropriate sets to summations
Reorganized introduction to LRLP-2

(1) Moded formulation of SLP-2 back into generalized network section to
clarify when the LRLP-2 discussion starts
(2) Described the changes in the LRLP-2 formulation before moving into
the extensive form of the SLP-2
Updated all figures.  Previous copies in the repository were old.

	new file:   images/prob_dec_cost_v_gammaprime_no_context.fig
	new file:   images/prob_dec_cost_v_gammaprime_no_context_multiple.fig
	new file:   images/prob_dec_cost_v_nl_n_20.fig
	new file:   images/water_prob_decrease.fig
Various small typo and language fixes

(1) Fixed some typos made with my previous changes.
(2) Tried to clarify the decomposition section
(3) Fixed remaining references of h' to h^\dagger