changes to plot function to wrap amplitude spectrum and fk spectrum
changes to plot function to wrap amplitude spectrum and fk spectrum

JuliaPackageMirrors/Seismic.jl,fercarozzi/Seismic.jl,SeismicJulia/Seismic.jl,juanisabbione/Seismic.jl,WneleiGao/Seismic.jl,aaronstanton/Seismic.jl,fercarozzi/myseismicjulia