Critical line algorithm

Toolset pfopt_cla: 1 tool.

Tool	What it does	Notes
`pfopt_cla`	The critical line algorithm: solves the bounded, fully invested mean-variance problem exactly, returning every turning point (corner portfolio) with its return, volatility and weights, the frontier curve between them (series + line chart), and the max-Sharpe or min-volatility weights with their performance.

Inputs, limits and outputs are described in Fincept Portfolio Optimizer. Full schemas: fincept_describe_tool.