Get run id fails if 000?.xyz exists

[milankl]

julia> run_speedy(trunc=341,output=true,output_dt=3,model=:shallowwater)
ERROR: ArgumentError: invalid base 10 digit '.' in "0007.tar.xz"
Stacktrace:
  [1] tryparse_internal(#unused#::Type{Int64}, s::String, startpos::Int64, endpos::Int64, base_::Int64, raise::Bool)
    @ Base ./parse.jl:137
  [2] parse(::Type{Int64}, s::String; base::Nothing)
    @ Base ./parse.jl:241
  [3] parse
    @ ./parse.jl:241 [inlined]
  [4] (::SpeedyWeather.var"#37#39")(id::String)
    @ SpeedyWeather ./none:0
  [5] iterate
    @ ./generator.jl:47 [inlined]
  [6] collect_to!
    @ ./array.jl:782 [inlined]
  [7] collect_to_with_first!
    @ ./array.jl:760 [inlined]
  [8] collect(itr::Base.Generator{Vector{String}, SpeedyWeather.var"#37#39"})
    @ Base ./array.jl:734
  [9] get_run_id_path(P::Parameters)
    @ SpeedyWeather ~/.julia/packages/SpeedyWeather/OJt3A/src/output.jl:14

[milankl]

Addressed with #99

[milankl]

Closed with merging of #99