fix hms test

fixes, debugging, wip on derel test

restore DERelative tests, drop zero init

* new does not support conditional
* old renamed to solveRLM_conditional (used in init)
 * old only supports one point type
 * solveRLM_sparse can be deleted, new performs better
 * 0.875540 seconds (5.11 M allocations: 543.265 MiB, 9.95% gc time)

Fix getPointType of Position{N}

Co-authored-by: Dehann Fourie <6412556+dehann@users.noreply.github.com>

Fix mixture sampling and deconv for static arrays

Refactor Parametric solve for better performance and better use of Manopt.jl

workaround hack for #1781

…1784)

* swop parametric optim for manopt

* improve non-parametric performance

* Standardise to use getManifold

* covariance calc try catch on hessian inverse

* Use CalcFactorNormSq as functor
* Force svector for performance
* Fix deconv manifold and init

NOTE #1786 (comment)