Missing snake case aliases for IncidenceMatrix

[YueRen]

A few types are still missing snake case aliases:

• PadicField

julia> PadicField(3,10)
Field of 3-adic numbers

julia> padic_field(3,10)
ERROR: MethodError: no method matching padic_field(::Int64, ::Int64)

Closest candidates are:
  padic_field(::Integer; precision, cached, check)
   @ Nemo ~/.julia/packages/Nemo/u9kPx/src/flint/padic.jl:786

Stacktrace:
 [1] top-level scope
   @ REPL[20]:1

• IncidenceMatrix

julia> IncidenceMatrix([[1,2],[3,4]])
2×4 IncidenceMatrix
[1, 2]
[3, 4]

julia> incidence_matrix([[1,2],[3,4]])
ERROR: MethodError: no method matching incidence_matrix(::Vector{Vector{Int64}})

Closest candidates are:
  incidence_matrix(::Graph{T}) where T<:Union{Directed, Undirected}
   @ Oscar ~/.julia/dev/Oscar/src/Combinatorics/Graphs/functions.jl:639

Stacktrace:
 [1] top-level scope
   @ REPL[23]:1

[joschmitt]

The $p$-adic fields are now User-Friendly (TM), so one does not need to give the precision. The recommended way of generating a $p$-adic field is now padic_field(3). Or possibly padic_field(3, precision = 10).

[lgoettgens]

Maybe @benlorenz or @lkastner could have a look at this?