Interactive launcher with mineral controls, navigation, and net-pay statistics

[dougchristie]

Adds a standalone interactive launcher (main.py + run_petropy.bat) plus viewer/toolbar additions in petropy/graphs.py. No changes to log.py.

main.py — launcher app

• Tk file picker for LAS file, plot template, figure size, optional tops CSV, and an optional "run porosity & saturation" toggle.
• Calculation-parameters dialog with depth range, fluid properties, porosity/Sw parameters, and mineral on/off checkboxes (Quartz / Calcite / Dolomite). Defaults to a sandstone/shale set so the multimineral solve isn't forced into a quartz+calcite+dolomite carbonate fit when none is present (which produces meaningless splits without a PE curve).
• Zero-fill backfill for deselected minerals so the viewer's cumulative MINERALOGY track doesn't prompt for missing V* curves.
• A "what next?" menu loop after the viewer is closed:
  • Change template / redraw
  • Edit calc parameters & re-run
  • Net pay & statistics…
  • Open another LAS file
  • Quit
    Loaded log + calculations stay in memory, so template switches and re-runs don't make you re-pick the file.
• Net pay & per-formation statistics workflow: a cutoffs dialog (PHIE ≥, SW ≤, VCLAY ≤, RESDEEP ≥ — blanks skip a cutoff) with per-formation checkboxes drives log.add_pay_flag + log.summations + log.statistics. Displays a ttk.Treeview table with Formation, Gross (ft), Net Pay (ft), N/G, Avg φ (pay), Avg Sw (pay), Avg Vclay (pay), HC pore-feet (pay), OIP/GIP (pay) and a Save CSV button.
• run_calculations now auto-runs log.summations() on OIP/GIP/GIP_FREE/GIP_ADS/PHIE/BVH/BVW whenever tops are loaded, so the multimin_oil_sum / multimin_gas_sum templates render their OIP/GIP overlay tracks without prompting for missing *_SUM curves.

petropy/graphs.py — viewer toolbar additions

• Recalc / Template / Open File toolbar buttons (with 24×24 RGBA icons) that hand control back to the launcher loop, so you can iterate without closing the window first. Wrapped in try/except so a backend that dislikes them can't break the viewer; closing the window directly always falls back to the menu.
• Missing-curve remap dialog for templates that reference curves not present in the LAS (lets you map an existing curve or skip).

run_petropy.bat

Windows launcher targeting an isolated conda environment so dependencies don't share with other projects.

Note on companion fixes

This PR is independent of #12 (which proposes three correctness fixes in log.py: Simandoux Sw exponent, mud-filtrate Rmf field, and the nanmean Buckles parameter fix). The launcher works against the current log.py, but the cumulative POROSITY track will only render correctly once #12 is also merged — without that fix, BVWI/BVWF come out NaN and poison the stack.

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